*{
    margin: 0;
    padding: 0;
}
table{
    border-collapse: collapse;
}
head , body{
    width: 100%;
    height: 100%;
    position: relative;
}
td{
    width: 100px;
    height: 50px;
    border:1px solid #000 ;
    text-align: center;
    font-size: 20px;
}

.yi{
    width: 400px;
    height: 400px;
    background-color: #ccc;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 40px;
    position: absolute;
    top: 0;
    right: 0;
    display: none;
    margin-left:20px;

}
.all{
    width: 1000px;
}
.all>div{
    width: 100%;
    display: flex;
    margin-top:20px ;
}
.yi1{
    width: 100px;
    border: 1px solid black;
    background-color: gray;
    opacity: 0.5;
    text-align: center;
    
}


.all input{
    width: 200px;
    height: 24px;

}
.change{
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    position: fixed;
    top:0;
    left: 0;
}
